anger vs combust

anger is a noun but combust is not a noun.

Word	Noun	Adjective	Verb	Adverb
anger	Yes	No	Yes	No
combust	No	No	Yes	No

As verbs, combust is a hyponym of anger; that is, combust is a word with a more specific, narrower meaning than anger:

anger (noun)	combust (noun)
belligerence aroused by a real or supposed wrong (personified as one of the deadly sins)
a strong emotion; a feeling that is oriented toward some real or supposed grievance
the state of being angry

anger (verb)	combust (verb)
make angry	undergo combustion
become angry	get very angry and fly into a rage
	cause to become violent or angry
	start to burn or burst into flames
	cause to burn or combust